parser.h

   1 #ifndef __PARSER_H__
   2 #define __PARSER_H__
   3
   4 /* global variables */
   5
   6 extern double answer;
   7
   8 /* function type */
   9
  10 typedef enum {
  11     Val = 0, Sig,
  12     Add, Sub,
  13     Mul, Div, Mod,
  14     Pow, Sqr,
  15     Cos, Sin, Atan,
  16     Log, Exp,
  17     Store, Recall, Disp,
  18     Quit, Help,
  19     Ans, E, Pi,
  20     Equal, Diff, Ge, Le, Gt, Lt
  21 } func_t;
  22
  23 /* keyword type */
  24
  25 typedef struct _keyword_t {
  26     char *keyword;
  27     func_t func;
  28     int nbops;
  29     int offset;
  30     int prio;
  31 } keyword_t;
  32
  33 /* calculus element type */
  34
  35 #define MAX_OPERANDS 10
  36 typedef struct _element_t {
  37     func_t func;
  38     int nbops;
  39     struct _element_t *ops[MAX_OPERANDS];
  40     double value;
  41     int prio;
  42 } element_t;
  43
  44 #define ERROR_OP ((element_t *)(-1))
  45
  46 /* parser function */
  47
  48 void delelement (element_t *root);
  49
  50 element_t *parser (char *str, char **next, int prio);
  51
  52 void print_element (element_t *root, int level);
  53
  54 double evaluate_element (element_t *root, char mask);
  55
  56 #endif /* __PARSER_H__ */
  57
  58 /* vim: set ts=4 sw=4 et: */